CN109390690B - Antenna unit and array antenna applied to 5G - Google Patents

Abstract

The invention discloses an antenna unit and an array antenna applied to 5G, wherein a radiation patch in the antenna unit is a metal frame formed by surrounding four rectangles, the size of the antenna is reduced, and the antenna can cover 3.4GHz and 4.9GHz frequency bands of 5G. Meanwhile, the antenna units are symmetrical about the center, so that the frequency band covered by the antenna cannot be changed at the symmetrical position of the microstrip feeder, and the antenna array is convenient. Through two radiating element arrays and the addition of a decoupling network on the ground plane, the working frequency band of the antenna meets the double-frequency characteristics of 2.98GHz-3.78GHz and 4.62GHz-5.36GHz, and can cover the working frequency bands of 3.3GHz-3.6GHz and 4.8GHz-5GHz required by 5G; by adjusting the decoupling network, the isolation between the antenna units is effectively improved, and the operation of the array antenna is ensured; the array antenna has novel and simple structure, small volume and low cost.

Description

An antenna unit and array antenna used in 5G

Technical field

The invention belongs to the field of wireless communication technology, and relates to a dual-band miniaturized antenna unit and an array antenna, and in particular, to an antenna unit and an array antenna applied to 5G.

Background technique

With the rapid development of wireless communication systems, the commercial use of fifth-generation mobile communication technology (5G) is just around the corner. Antennas are the most important functional components in mobile communication systems. The research and design of terminal antennas for 5G communication applications have become a hot topic in recent years. In 2017, the Ministry of Industry and Information Technology issued the "Notice on Matters Concerning the Use of the 3300MHz-3600 MHz and 4800MHz-5000 MHz Frequency Bands in the Fifth Generation Mobile Communication System" to determine the 5G commercial communication frequency band in my country. One of the key components of the 5G communication system is 5G antenna system. In order to meet the high-rate information transmission requirements of 5G, it is necessary to arrange multiple antenna units to form an array antenna to improve its gain, and to increase the information transmission capacity through multiple antennas. As an array antenna used in terminal equipment, the antenna system is required to have the characteristics of small size, small volume, and good radiation characteristics. The size of the array antenna is reduced by reducing the distance between the antenna units. However, as the distance between the antenna units decreases, mutual coupling will occur between the antenna units, which affects the working efficiency of the array antenna. Therefore, it is necessary to improve the isolation between the antenna units. Ensure the normal operation of the antenna system.

Contents of the invention

In order to solve the deficiencies of the existing technology, the present invention provides an antenna unit and an array antenna for 5G, which are used to increase the antenna gain and channel capacity while reducing the volume and size of the antenna.

The technical solution of the present invention to solve the technical problem is to design an antenna unit applied to 5G. The antenna unit includes a radiation patch (106), a microstrip feeder (107), and a ground plane (108). The ground plane (108) 108) is printed on the bottom of the back of the No. 1 dielectric substrate (101) and covers the lower edge and the left and right edges of the back of the No. 1 dielectric substrate (101); a radiation patch is printed on the front of the No. 1 dielectric substrate (101) (106) and the microstrip feeder (107), the radiation patch (106) is connected to the microstrip feeder (107), the radiation patch (106) is on the upper part of the front of the No. 1 dielectric substrate (101) and its surroundings are not covered At the edge of the No. 1 dielectric substrate (101), one end of the microstrip feeder (107) is connected below one side of the radiation patch (106), and its other end extends to the lower edge of the No. 1 dielectric substrate (101);

The radiation patch (106) is formed by interconnecting the No. 1 rectangular patch (102), the No. 2 rectangular patch (103), the No. 3 rectangular patch (104), and the No. 4 rectangular patch (105). The rectangular metal frame is symmetrical about the center line of the No. 1 dielectric substrate (101); the microstrip feeder (107) is rectangular and is located on one side below the rectangular metal frame; the ground plane (108) is rectangle.

Furthermore, the present invention designs an array antenna applied to 5G. The array antenna includes two antenna units as described above and a decoupling network. The two antenna units are symmetrical and the radiation patches are printed on both sides without electrical contact. on the No. 2 dielectric substrate (200); the two sides of the front of the No. 2 dielectric substrate (200) are respectively the No. 1 radiation unit (201) and the No. 2 radiation unit (202). Each radiation unit includes a radiation patch and a microstrip. The feeder, the microstrip feeder of the two radiating units is located inside the No. 2 dielectric substrate (200); the decoupling network is printed on the back of the No. 2 dielectric substrate (200), and its lower end is connected to the ground plane of each antenna unit respectively; so The decoupling network is composed of three U-shaped metal patches nested and connected to each other, and is symmetrical about the center line of the No. 2 dielectric substrate (200);

The decoupling network is located on the upper part of the ground plane and consists of U-shaped metal patch No. 1 (U1), U-shaped metal patch No. 2 (U2) and U-shaped metal patch No. 3 (U3) nested and connected to each other. The open ends of each U-shaped metal patch face downward; the decoupling network is connected to the ground plane and is symmetrically arranged with respect to the center line of the No. 2 dielectric substrate (200); the No. 1 U-shaped metal patch in the decoupling network The lower two ends of the piece (U1) are connected to the ground planes of the two antenna units respectively; the No. 2 U-shaped metal patch (U2) in the decoupling network is located on the upper part of the No. 1 U-shaped metal patch (U1) and The two are connected, and the No. 3 U-shaped metal patch (U3) of the decoupling network is located on the top of the No. 2 U-shaped metal patch (U2) and the two are connected;

The No. 1 ground plane (204) and the No. 2 ground plane (203) of the two antenna units are placed 4 mm apart and printed on the back of the No. 2 dielectric substrate (200).

Compared with the existing technology, the beneficial effects of the present invention are: the radiation patch in the antenna unit of the present invention is a metal frame surrounded by four rectangles, which effectively reduces the size of the antenna and ensures that the antenna can cover 5G 3.4GHz and 4.9GHz frequency bands. At the same time, the antenna unit is symmetrical about the center, so that the symmetrical position of the microstrip feeder does not change the frequency band covered by the antenna, which facilitates antenna array formation. By forming an array of two radiating units and adding a decoupling network on the ground plane, the antenna's working frequency band meets the dual-band characteristics of 2.98GHz-3.78GHz and 4.62GHz-5.36GHz, and can cover the 3.3GHz-3.6 required by 5G GHz and 4.8GHz-5GHz operating frequency bands; by adjusting the decoupling network, the isolation between antenna units is effectively improved, ensuring the operation of the array antenna; the array antenna has a novel and simple structure, small size and low cost.

Description of the drawings

Figure 1 is a schematic front structural diagram of an embodiment of an antenna unit applied to 5G according to the present invention.

Figure 2 is a schematic structural diagram of the back of an antenna unit applied to 5G according to one embodiment of the present invention.

Figure 3 is a return loss curve diagram of an antenna unit applied to 5G in Embodiment 1 of the present invention.

Figure 4 is a voltage standing wave ratio curve diagram of an antenna unit applied to 5G in Embodiment 1 of the present invention.

Figure 5 is a radiation pattern at 3.4GHz of an antenna unit applied to 5G in Embodiment 1 of the present invention.

Figure 6 is a radiation pattern at 4.9GHz of an antenna unit applied to 5G in Embodiment 1 of the present invention.

FIG. 7 is a schematic front structural view of an array antenna applied to 5G according to an embodiment of the present invention.

FIG. 8 is a schematic structural diagram of the back of an array antenna applied to 5G according to an embodiment of the present invention.

Figure 9 is a schematic diagram of the decoupled network structure of an array antenna applied to 5G according to an embodiment of the present invention.

Figure 10 is a return loss curve diagram of an array antenna applied to 5G in Embodiment 2 of the present invention.

Figure 11 is an inter-unit forward reflection curve diagram of an array antenna applied to 5G in Embodiment 2 of the present invention.

Figure 12 is a voltage standing wave ratio curve diagram of an array antenna applied to 5G in Embodiment 2 of the present invention.

Figure 13 is a radiation pattern at 3.4GHz of an array antenna applied to 5G in Embodiment 2 of the present invention.

Figure 14 is a radiation pattern at 4.9GHz of an array antenna applied to 5G in Embodiment 2 of the present invention.

Figure 15 is a peak gain diagram of an array antenna applied to 5G in Embodiment 2 of the present invention.

Detailed ways

The present invention will be further described in detail below with reference to the embodiments and drawings.

The present invention provides an antenna unit (antenna unit for short, see Figure 1-2) for 5G, which includes a radiation patch 106, a microstrip feeder 107 and a ground plane 108. The ground plane 108 is printed on the back of the No. 1 dielectric substrate 101. The bottom covers the lower edge and the left and right edges of the back of the No. 1 dielectric substrate 101; the No. 1 dielectric substrate 101 has a radiation patch 106 and a microstrip feeder 107 printed on the front. The radiation patch 106 and the microstrip feeder 107 is connected, the radiation patch 106 is on the upper part of the front of the No. 1 dielectric substrate 101 and its surroundings do not cover the edge of the No. 1 dielectric substrate 101. One end of the microstrip feeder 107 is connected below one side of the radiation patch 106, and the other end extends to the lower edge of dielectric substrate 101;

The radiation patch 106 is a rectangular metal frame surrounded by a No. 1 rectangular patch 102, a No. 2 rectangular patch 103, a No. 3 rectangular patch 104, and a No. 4 rectangular patch 105 connected to each other, and the rectangular metal frame is about a The center line of the dielectric substrate 101 is symmetrical; the microstrip feeder 107 is rectangular and is located on one side below the rectangular metal frame; the ground plane 108 is rectangular.

The length and width of the No. 1 rectangular patch 102 and the No. 3 rectangular patch 104 are equal, and they are arranged relative to the center line of the No. 1 dielectric substrate 101, forming a symmetrical structure; the No. 2 rectangular patch 103 and the No. 4 rectangular patch 105 has equal lengths and different widths, with the larger width being located below the smaller width;

Further, the present invention provides an array antenna for 5G (array antenna for short, see Figures 7-9). The array antenna includes two antenna units as described above and a decoupling network. The two antenna units are symmetrical and The radiation patch is printed on the No. 2 dielectric substrate 200 without electrical contact. The two sides of the front of the No. 2 dielectric substrate 200 are respectively the No. 1 radiation unit 201 and the No. 2 radiation unit 202. Each radiation unit includes a radiation patch. and a microstrip feeder. The microstrip feeders of the two radiating units are located inside the No. 2 dielectric substrate 200 (outward from the left and right edges of the dielectric substrate). The decoupling network is printed on the back of the second dielectric substrate 200, and its lower end is connected to the ground plane of each antenna unit respectively. The decoupling network is composed of three U-shaped metal patches nested and connected to each other, and is symmetrical about the center line of the second dielectric substrate 200; through the branches added by the decoupling network, the isolation between antenna units can be effectively improved.

The decoupling network is located on the upper part of the ground plane and consists of U-shaped metal patch No. 1 U1, U-shaped metal patch No. 2 U2 and U-shaped metal patch U3 No. 3, which are nested and connected to each other. The three U-shaped metal patches The open ends of the decoupling network are all facing downward; the decoupling network is connected to the ground plane and is arranged symmetrically about the center line of the No. 2 dielectric substrate 200; the lower ends of the No. 1 U-shaped metal patch U1 in the decoupling network are respectively connected with The ground planes of the two antenna units are connected; the No. 2 U-shaped metal patch U2 in the decoupling network is located on the upper part of the No. 1 U-shaped metal patch U1 and the two are connected, and the No. 3 U-shaped metal patch U2 in the decoupling network is The U-shaped metal patch U3 is located on the upper part of the second U-shaped metal patch U2 and the two are connected.

Example 1

This embodiment 1 provides an antenna unit applied to 5G, including a radiation patch 106, a microstrip feeder 107 and a ground plane 108. The ground plane 108 is printed on the bottom of the back of the No. 1 dielectric substrate 101 and covers the back of the No. 1 dielectric substrate 101. The lower edge and the left and right sides of the No. 1 dielectric substrate 101 are printed with a radiation patch 106 and a microstrip feeder 107 on the front. The radiation patch 106 is connected to the microstrip feeder 107. The radiation patch 106 is on The upper part of the front of the No. 1 dielectric substrate 101 and its surrounding area does not cover the edge of the No. 1 dielectric substrate 101. One end of the microstrip feeder 107 is connected below one side of the radiation patch 106, and the other end extends to the lower edge of the No. 1 dielectric substrate 101. place;

The radiation patch 106 is a rectangular metal frame surrounded by a No. 1 rectangular patch 102, a No. 2 rectangular patch 103, a No. 3 rectangular patch 104, and a No. 4 rectangular patch 105 connected to each other, and the rectangular metal frame is about a The center line of the dielectric substrate 101 is symmetrical; the microstrip feeder 107 is rectangular and is located on one side below the rectangular metal frame; the ground plane 108 is rectangular.

The length and width of the No. 1 rectangular patch 102 and the No. 3 rectangular patch 104 are equal, and they are arranged relative to the center line of the No. 1 dielectric substrate 101, forming a symmetrical structure; the No. 2 rectangular patch 103 and the No. 4 rectangular patch 105 has equal lengths and different widths, with the larger width being located below the smaller width;

In this embodiment, the shape of the No. 1 dielectric substrate 101 is rectangular, its material is polytetrafluoroethylene (PTFE), and its dielectric constant is 3.5. The length, width, and height of the No. 1 dielectric substrate 101 are 19 mm × 34 mm × 1.6 mm;

The radiation patch 106 is composed of a No. 1 rectangular patch 102, a No. 2 rectangular patch 103, a No. 3 rectangular patch 104 and a No. 4 rectangular patch 105 connected to each other. The length ab of the No. 1 rectangular patch 102 is 20 mm, and the width bd is 5 mm; the length cf of the No. 2 rectangular patch 103 is 16 mm, and the width fg is 0.5 mm; The length gh of the No. 4 rectangular patch 104 is 20 mm, and the width eg is 5 mm; the length kj of the No. 4 rectangular patch 105 is 16 mm, and the width hj is 1 mm;

The length and width of the microstrip feeder 107 are 4.5 mm × 11 mm. The distance between the center line of the microstrip feeder 107 and the center line of the No. 1 dielectric substrate 101 is 4 mm. The distance between the microstrip feeder 107 and the center line of the No. 1 dielectric substrate 101 is 4 mm. 4mm on the side or 4mm on the right does not affect the antenna operating frequency;

The length and width of the ground plane 108 are 19mm×11mm;

Figure 3 shows the return loss curve of the antenna unit in this embodiment. It can be seen from Figure 3 that the return loss of the antenna unit in the 3.04GHz-4.94GHz and 4.52GHz-5.48GHz frequency bands is less than -10dB, which enables the antenna unit to work in In the 3.04GHz-4.94GHz and 4.52GHz-5.48GHz frequency bands, the return loss in the 3.3GHz-3.6GHz and 4.8GHz-5.0GHz frequency bands is greater than -10dB, which enables the antenna unit to effectively work in the 5G frequency band.

Figure 4 is a voltage standing wave ratio curve diagram of the antenna unit in this embodiment. It can be seen from the figure that the voltage standing wave ratio of the antenna unit in the frequency band where the return loss is less than -10dB is less than 2, which meets the engineering requirements.

Figures 5 and 6 are respectively the directional diagrams of the antenna unit of this embodiment at frequencies of 3.4GHz and 4.9GHz. In the figure, E/H refers to the electric field or magnetic field. From the figure, it can be seen that the antenna of this embodiment The unit radiation pattern has good directivity on the H and E surfaces.

The antenna unit of the present invention has small size, simple structure, wide working frequency band, and is suitable for 5G systems. As an antenna unit, it has good working directionality and small size, which is conducive to forming an array antenna.

Example 2

This embodiment provides an array antenna applied to 5G (see Figures 7-9). The array antenna includes two antenna units as described above and a decoupling network. The two antenna units are symmetrical and the radiation patch has no electrical properties. The contact is printed on the No. 2 dielectric substrate 200. The two sides of the front of the No. 2 dielectric substrate 200 are the No. 1 radiating unit 201 and the No. 2 radiating unit 202. Each radiating unit includes a radiation patch and a microstrip feeder. The microstrip feed lines of the two radiating units are located inside the No. 2 dielectric substrate 200 (outward from the left and right edges of the dielectric substrate). The decoupling network is printed on the back of the second dielectric substrate 200, and its lower end is connected to the ground plane of each antenna unit respectively. The decoupling network is composed of three U-shaped metal patches nested and connected to each other, and is symmetrical about the center line of the second dielectric substrate 200; through the branches added by the decoupling network, the isolation between antenna units can be effectively improved.

The decoupling network (see Figure 9) is located on the upper part of the ground plane and consists of the No. 1 U-shaped metal patch U1, the No. 2 U-shaped metal patch U2 and the No. 3 U-shaped metal patch U3, which are nested and connected to each other. The open ends of the U-shaped metal patches all face downward; the decoupling network is connected to the ground plane and is symmetrically arranged with respect to the center line of the second dielectric substrate 200; the No. 1 U-shaped metal patch U1 in the decoupling network Both ends of the lower part are connected to the ground planes of the two antenna units respectively; the No. 2 U-shaped metal patch U2 in the decoupling network is located on the upper part of the No. 1 U-shaped metal patch U1 and the two are connected. The No. 3 U-shaped metal patch U3 of the network is located on the top of the No. 2 U-shaped metal patch U2 and the two are connected. By adding a decoupling network, the isolation between antenna units can be effectively improved.

In this embodiment, the shape of the No. 2 dielectric substrate 200 is rectangular, the material is polytetrafluoroethylene (PTFE), and the dielectric constant is 3.5. The length, width, and height of the No. 2 dielectric substrate 200 are 42 mm × 34 mm × 1.6 mm.

The No. 1 ground plane 204 and the No. 2 ground plane 203 of the two antenna units are placed 4mm apart and printed on the back of the No. 2 dielectric substrate 200; the No. 1 radiating unit 201, the No. 2 radiating unit 202 and the No. 1 ground plane 204 and The dimensions of the second ground plane 203 are the same as those in Embodiment 1;

The No. 1 U-shaped metal patch U1 is composed of two No. 5 rectangular patches U101 and a No. 6 rectangular patch U102. The two No. 5 rectangular patches U101 are placed symmetrically about the center line of the No. 2 dielectric substrate 200. The rectangular patch U102 is located on the top of the two No. 5 rectangular patches U101. The two ends of the No. 6 rectangular patch U102 are aligned with the outsides of the two No. 5 rectangular patches U101 respectively; the length and width dimensions of the No. 6 rectangular patch U102 are 25mm × 0.5mm, the length and width of the No. 5 rectangular patch U101 are 0.5mm × 2.1mm; the distance between the two No. 5 rectangular patches U101 is 24mm; the No. 5 rectangular patch U101 on the right and the No. 1 ground plane The distance mn between the upper left endpoint of 204 is 10mm.

The No. 2 U-shaped metal patch U2 is composed of two No. 7 rectangular patches U201 and a No. 8 rectangular patch U202. The two No. 7 rectangular patches U201 are placed symmetrically about the center line of the No. 2 dielectric substrate 200, and the No. 8 rectangular patch U202 is The patch U202 is located on the top of the two No. 7 rectangular patches U201. The two ends of the No. 8 rectangular patch U202 are aligned with the outsides of the two No. 7 rectangular patches U201 respectively; the No. 7 rectangular patch U201 on the right side is distanced from the No. 5 rectangle. The distance op of patch U101 is 8.9mm; the length and width dimensions of No. 7 rectangular patch U201 are 0.5mm×2mm, and the length and width dimensions of No. 8 rectangular patch U202 are 7.2mm×0.4mm.

The No. 3 U-shaped metal patch U3 is symmetrical about the center line of the No. 2 dielectric substrate 200 and consists of two No. 9 rectangular patches U301 and a No. 10 rectangular patch U302. The two No. 9 rectangular patches U301 are about the No. 2 medium. The center line of the substrate 200 is placed symmetrically. The No. 10 rectangular patch U302 is located on the top of the two No. 9 rectangular patches U301. The two ends of the No. 10 rectangular patch U302 are aligned with the outsides of the two No. 9 rectangular patches U301 respectively; The length and width of the rectangular patch U301 are 0.1mm×7.1mm, and the length and width of the No. 10 rectangular patch U302 are 7.2mm×0.3mm.

Figure 10 is the return loss curve of the array antenna in this embodiment. It can be seen from Figure 10 that the return loss of the array antenna in the 2.98GHz-3.78GHz and 4.62GHz-5.36GHz frequency bands is less than -10dB. Figure 11 is the array in this embodiment. From the forward reflection curve between antenna units, it can be seen from Figure 11 that the forward reflection coefficient of the array antenna in the 3.25GHz-3.67GHz and 4.82GHz-5.15GHz frequency bands is lower than -15dB; this allows the array antenna to work in the 3.25GHz- The return loss in the 3.67GHz and 4.82GHz-5.15GHz frequency bands, the 3.3GHz-3.6GHz and 4.8GHz-5.0GHz frequency bands is greater than -10dB, and the forward reflection coefficient between antenna units is less than -15dB, which enables the array antenna to effectively Works in 5G frequency band;

Figure 12 is a voltage standing wave ratio curve diagram of the array antenna of this embodiment. It can be seen from the figure that the voltage standing wave ratio of the array antenna in the frequency band where the return loss is less than -10dB is less than 2, which meets the engineering requirements;

Figures 13 and 14 are respectively the directional diagrams of the array antenna of this embodiment corresponding to the antenna at frequencies of 3.4GHz and 4.9GHz. In the figure, E/H refers to the electric field or magnetic field. From the figure, it can be seen that the array antenna of this embodiment is The radiation pattern is omnidirectional on the H plane and has good directivity on the E plane. This is because the array antenna has two antenna units placed symmetrically about the center line. When the dual antennas are working, they can radiate the field in the direction. Superimposed on top to form omnidirectional radiation;

Figure 15 is the peak gain diagram of the array antenna in this implementation. The abscissa in Figure 15 is the frequency, and the ordinate is the gain. From Figure 15, it can be seen that the array antenna has the same gain in the 3.4GHz-3.6GHz and 4.8GHz-5GHz frequency bands. Greater than 4.5dB, indicating that the array antenna has higher gain in the working frequency band;

The array antenna of the present invention has a small size and a simple structure. Through the use of a decoupling network, the distance between the antennas can be greatly reduced, ensuring that the two antenna units can work normally, and through the symmetrical placement of the two antennas, good omnidirectional radiation is formed. characteristic.

The parts not described in the present invention are applicable to the existing technology.

Claims (2)

1. An array antenna applied to 5G, characterized in that the array antenna includes two antenna units and a decoupling network. The two antenna units are symmetrical and the radiation patch is printed on the No. 2 dielectric substrate without electrical contact. (200); wherein, the No. 1 antenna unit includes the No. 1 radiating unit (201) and the No. 1 ground plane (204), and the No. 2 antenna unit includes the No. 2 radiating unit (202) and the No. 2 ground plane (203); The No. 2 radiating unit (201) and the No. 2 radiating unit (202) are respectively printed on the left and right sides of the front of the No. 2 dielectric substrate (200). The No. 2 ground plane (203) and the No. 1 ground plane (204) are placed 4mm apart. On the back side of the No. 2 dielectric substrate (200); Each radiation unit includes a radiation patch (106) and a microstrip feeder (107). The radiation patch (106) is connected to the microstrip feeder (107). The radiation patch (106) is on the No. 2 dielectric substrate (200). ) The upper part of one side of the front surface and its surroundings are not covered by the edge of the No. 2 dielectric substrate (200). One end of the microstrip feeder (107) is connected to the bottom of one side of the radiation patch (106), and the other end extends to the No. 2 dielectric substrate (200). At the lower edge of the dielectric substrate (200); the No. 2 ground plane (203) and the No. 1 ground plane (204) are respectively printed on the left and right sides of the bottom of the back of the No. 2 dielectric substrate (200), where the left ground plane The ground covers the lower edge and the left edge of the back of the No. 2 dielectric substrate (200), and the right ground plane covers the lower edge and the right edge of the back of the No. 2 dielectric substrate (200); The ground plane is rectangular; the radiation patches (106) are No. 1 rectangular patch (102), No. 2 rectangular patch (103), No. 3 rectangular patch (104), and No. 4 rectangular patch (104). 105) A rectangular metal frame surrounded by mutual connections, and the rectangular metal frame is symmetrical about the center line of the ground plane of the corresponding radiating unit; the microstrip feeder (107) is rectangular and is located on one side below the rectangular metal frame; The length and width of the No. 1 rectangular patch (102) and the No. 3 rectangular patch (104) are equal, and they are arranged relative to the center line of the ground plane of the corresponding radiating unit, showing a symmetrical structure; the No. 2 rectangular patch (103) ) and No. 4 rectangular patch (105) have equal lengths and different widths, with the larger width being located below the smaller width; The length dimension of the No. 1 rectangular patch (102) is 20mm and the width dimension is 5mm; the length dimension of the No. 2 rectangular patch (103) is 16mm and the width dimension is 0.5mm; the No. 3 rectangular patch The length dimension of (104) is 20mm and the width dimension is 5mm; the length dimension of the No. 4 rectangular patch (105) is 16mm and the width dimension is 1mm; The length and width of the microstrip feeder (107) are 4.5mm×11mm. The distance between the centerline of the microstrip feeder (107) and the centerline of the ground plane of the corresponding radiating unit is 4mm. The microstrip feeders of the two radiating units are located at The inside of the No. 2 dielectric substrate (200); the length and width dimensions of the No. 2 ground plane (203) and the No. 1 ground plane (204) are both 19mm×11mm; The decoupling network is printed on the back of the No. 2 dielectric substrate (200), and its lower end is connected to the ground plane of each antenna unit respectively; the decoupling network is composed of three U-shaped metal patches nested and connected to each other, and about the two The center line of the dielectric substrate (200) is symmetrical; The decoupling network is located on the upper part of the ground plane and consists of U-shaped metal patch No. 1 (U1), U-shaped metal patch No. 2 (U2) and U-shaped metal patch No. 3 (U3) nested and connected to each other. The open ends of each U-shaped metal patch face downward; the decoupling network is connected to the ground plane and is symmetrically arranged with respect to the center line of the No. 2 dielectric substrate (200); the No. 1 U-shaped metal patch in the decoupling network The lower two ends of the piece (U1) are connected to the ground planes of the two antenna units respectively; the No. 2 U-shaped metal patch (U2) in the decoupling network is located on the upper part of the No. 1 U-shaped metal patch (U1) and The two are connected, and the No. 3 U-shaped metal patch (U3) of the decoupling network is located on the top of the No. 2 U-shaped metal patch (U2) and the two are connected; The No. 1 U-shaped metal patch (U1) is composed of two No. 5 rectangular patches (U101) and a No. 6 rectangular patch (U102). Two of the No. 5 rectangular patches (U101) are about the No. 2 dielectric substrate. (200) is placed symmetrically on the center line. The No. 6 rectangular patch (U102) is located on the top of the two No. 5 rectangular patches (U101). The two ends of the No. 6 rectangular patch (U102) are in contact with the two No. 5 rectangular patches (U102). The outer sides of U101) are aligned respectively; the length and width of the No. 6 rectangular patch (U102) are 25mm × 0.5mm, and the length and width of the No. 5 rectangular patch (U101) are 0.5mm × 2.1mm; the length and width of the two No. 5 rectangular patches are The distance between the patches (U101) is 24mm; the distance between the upper left endpoint of the No. 5 rectangular patch (U101) on the right side and the No. 1 ground plane (204) is 10mm; The No. 2 U-shaped metal patch (U2) consists of two No. 7 rectangular patches (U201) and a No. 8 rectangular patch (U202). Two of the No. 7 rectangular patches (U201) are about the No. 2 dielectric substrate ( 200) are placed symmetrically along the center line. The No. 8 rectangular patch (U202) is located on the top of the two No. 7 rectangular patches (U201). The two ends of the No. 8 rectangular patch (U202) are in contact with the two No. 7 rectangular patches (U201). ) are aligned respectively; the distance between the No. 7 rectangular patch (U201) on the right and the No. 5 rectangular patch (U101) is 8.9mm; the length and width of the No. 7 rectangular patch (U201) are 0.5mm × 2mm, and the length and width of the No. 7 rectangular patch (U201) are 0.5mm The length and width dimensions of the No. rectangular patch (U202) are 7.2mm×0.4mm; The No. 3 U-shaped metal patch (U3) is symmetrical about the center line of the No. 2 dielectric substrate (200) and consists of two No. 9 rectangular patches (U301) and one No. 10 rectangular patch (U302). Two of the No. 9 rectangular patches (U302) The rectangular patch (U301) is placed symmetrically about the center line of the No. 2 dielectric substrate (200). The No. 10 rectangular patch (U302) is located on the top of the two No. 9 rectangular patches (U301). The No. 10 rectangular patch (U302) is The two ends are aligned with the outsides of the two No. 9 rectangular patches (U301) respectively; the length and width dimensions of the No. 9 rectangular patch (U301) are 0.1mm×7.1mm, and the length and width dimensions of the No. 10 rectangular patch (U302) are 7.2mm×0.3mm. 2. An array antenna applied to 5G according to claim 1, characterized in that the shape of the No. 2 dielectric substrate (200) is a rectangle, the length, width and height are 42mm×34mm×1.6mm; its material is polyethylene. Tetrafluoroethylene has a dielectric constant of 3.5.